Switching mechanism



June 13, 1933. L. E. EASTMAN SWITCHING MECHANI SM 3 Sheets-Sheet 2 QM l 14] ATTORNEY Filed Sept.

June 13, 1933. L. E. EASTMAN SWITCHING MECHANISM Filed Sept. 25, 1930 3 Sheets-Sheet 3 INVENTOR Q BY m ATTORNEY,

Patented June 13, 1933 UNITED STATES PATENT OFFICE.

' LEONARD E. EASTMAN, OF SPRINGFIELD, MASSACHUSETTS, ASSIGNOR TO AMERICAN BOSCH MAGNETO CORPORATION, OF SPRINGFIELD, MASSACHUSETTS, A CORPORA- 'IION OF NEW YORK SWITCHING MECHANISM Application filed September 23, 1930. Serial 'No. 483,801.

contacts arranged to engage the terminals of an electrical element, reactance or circuit, and the said element is arranged to be actuated by a member connected thereto.

The switching mechanism comprises, preferably, manually operable means for reciprocating a suitable member whereby in turn the saidswitch element or a plurality of them may be simultaneously actuated, rotated or oscillated to perform its switching function.

In the specific application above described, the metal contacts are arranged to be moved with the switch element into engagement or contact with terminals on one or more loading reactances of the receiver, whereby the same may be short-circuited to change the reception from long wave to short wave.

The accompanying drawings illustrate my invention.

Fig. 1 is a plan view seen from the underside of Fig. 2 of my switching mechanism in combination with inductance reactances of a radio receiver; this figure being partly in section; I

Fig. 2 is an elevation thereof appearing as if seen from the top of Fig. 1;

Fig. 3 is a top plan view of the complete switching mechanism in one position, and Fig. 1 in the opposite position; these views being in sections taken along the line 34: on

Fig. 2;

Fig. 5 is a view of the actuating bar for the switch mechanism; this view being partially in section along the line 55 on Figure 1, and

Fig. 6 is a circuit diagram of a radio receiver embodying my switching mechanism. The switching mechanism comprises a manual member 1 mounted on a shaft- 2 journaled in bearings 3, l, mounted on base plate 5. The said shaft has rigidly mounted thereon. and rotatable therewith a cam 6 provided with a slot 7 in which rides a pin 8 secured to switch bar 9. The switch bar is provided with spring clips 10, 10, provided with pins 11, 11, passing through holesin saidswitch bar. The said clips are arranged to receive perforated cars 13, 13, of the switch elements 14, 14, and the said ears are secured in said clips by the pins 11, 11, passing through the perforations in said ears.

' The switch element is composed, preferably, of a ring or annular member 16 of insulative material, of which the ear forms an integral part. The said annular member rides-in the groove 17 of a cylindrical member or cup 18 and the ear passes through a slot 19 in said cup. The annular member is provided with metal contacts 20, 20, connected by a conductor 21, which contacts are arranged to engage the terminals of a circuit or electrical element or loading reactance, such as the inductance coil to be hereinafter identified. v

e The operation of the switching mechanism is clear from the drawings and the description. Rotation of the shaft 2 in one direction or the other shifts the switch bar in one in turn the switch bar rotates the switch elements in one direction or the other as the case may be. The limit of oscillation or rotation of the switch elements is set by the side walls of the slot 19 in the cup. Thus, the shaft 2 and switch elements rotate only through an arc, and the reversal of movement of the shaft reciprocates the switch bar which in turn oscillates the switch elements. For the specific application herein described, the arc need be only suflicient to have the metal contacts make and break contact with the terminals aforementioned. The slot in the cup will accordingly be of the dimensions necessary to delimit the required are of oscillation of the switch element.

Referring now particularly to Figs. 1 and 2, there is shown a coil assembly 30 comprising a relatively short-wave inductance coil 31 mounted on a support or tubular form 31 at right angles to a loading coil 32 on a tubular form or support 32. As shown in the circuit diagram Fig. 6 the said coils are connected in series, and the right angled disposition of the coils is indicated by the symbol identified as 33. The ends of the loading coil windings terminate in terminals 34, 34. The coil assembly is mounted at 35, 35, inside the annular switch element and the cup. The loading coil terminals are so alined as to permit engagement or contact therewith by the metal 1 contacts on the switch elementwhen the latter is rotated in one'direction and .to be disengagedtherefrom when said element is rotated in the. other direction, as clearly shown in Figs. land 3 respectively. The two metal contacts are electrically connected by conductor 21, so that the effect ofthe metal contacts engaging the terminals on the loading coil is to short-circuit the same, thereby changingthe range of reception from long. wave to short wave.

The circuit diagramFig. 6 disclosesa radio receiver having a plurality of tunable circuits 36 employingmy switching mechanism, the parts therein corresponding to the mechanical elements of. the. switching mechanism being designated with reference numerals similar to that employed in the mechanical figures.

Havingv described my invention, what I claim is:

1. The combination of acircumferentially grooved cylindrical member, an annular member supported in said groove, metal contacts on said annular member, a coil, a support projectingeinto said annular member and carrying the coil, terminals on-said coil, and means for actuating said annular member to make and break contact between said contacts and said terminals.

2. The combination of acircumferentially grooved and slotted cylindrical member, an annular member supported in said groove and having a part projectingthrough said slot, metal contacts on said annular member, a coil, a support projecting into said annular member and carrying the coil, terminals on said coil, and means engaging said projecting part for oscillatingsaid annular member to make and break contact between said contacts and.

said terminals.

3. The combination of a base plate, a plurality ofalined circumfer'entially grooved and slotted'cylindrical members mounted thereon, annular rotary switch elements having. their outer peripheries riding in said grooves and having ears projecting through said slots, metal contacts onsaid switch elements, coils, supports for said coils mounted inside said elements having terminals, and means engaging through said slots, inwardly disposed metal contacts'on-said elements, coils, supports for said coils mounted inside said switch elements and' on said base, terminals on said supports, and a reciprocating member to which the ears are connected, whereby said switch elementsmay be actuated to make and breakcontactbetween said contacts and said terminals.

In testimony whereof I afliX my signature.

LEONARD E. EASTMAN. 

